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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-22 2:04 |
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Conference: Bucharest University Faculty of Physics 2003 Meeting
Section: Nuclear and Elementary Particles Physics
Title:
Charged particle multiplicity in Au-Au and d-Au collisions at RHIC energies
Authors:
Ionut ARSENE for BRAHMS Collaboration
Affiliation:
Institute for Space Sciences, Magurele
E-mail
Keywords:
Abstract:
RHIC(Relativistic Heavy Ion Collider) is the bigest heavy ion accelerator in this moment and in the experiments performed there is the chance to observe the first signals of the so called "Quark Gluon Plasma", a veritable goldstone for Relativistic Heavy Ion Physics. At his actual energy, sqrt{s_NN}=200GeV, the four experiments taking place at RHIC(PHENIX,STAR,BRAHMS and PHOBOS) expect some results on this subject. One of the signals for the formation of QGP is, for example, a saturation of the number of parton collisions in central nucleus-nucleus collisions that could lead to a limit on the production of charged particles.
The present work try to investigate the multiplicity distributions of charged particles emited in relativistic heavy ion collisions between gold nuclei at sqrt{s_NN}=130GeV and sqrt{s_NN}=200GeV and between deuteron and gold at sqrt{s_NN}=200GeV. With this distributions we can obtain imediately the charged particle distribution normalized to the number of participating pairs, a more relevant information about the phenomena investigated.
The data is obtained using several detectors of the BRAHMS experiment, namely : the Multiplicity Array (MA), the Beam-Beam Counters (BBC), and the Zero Degree Calorimeters (ZDC). The MA cover the mid-rapidity region eta<|2.5| with a Si-strip detector array (SMA) close to the beam pipe (5.3 cm) and a plastic-scintillator tile array (TMA) placed around the Si-strip detector at about 13 cm from the beam axis. The BBC contain two sets of Cherenkov detectors placed at +-220cm from the nominal interaction point on both sides. These detectors cover the high rapidity part of the distribution. Due to the very good timing resolution, these detectors are used also for vertex determination and triggering for the entire experiment. The ZDC detectors measure the spectator fragments which are not scatered from collision. These detectors are used also for timing purposes.
Together with the experimental data, in this work will be presented for comparison some results obtained with the most known simulation codes (HIJING, UrQMD).
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